passing tissue and alot blood with heartbeat

I have been passing what it looks like uterine lining with blood for the last 2 days and I am 7 weeks pregnant. Mild backache with on/off cramping. I just got back from the ONGYN and they said they could still see a heartbeat... what is going on. any experience with this ???

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"Nothing in this world is more dangerous than sincere ignorance and conscientious stupidity" ~ MLK

i had the same thing happen with my first pregnancy. bleeding and passing clots lasted from 14 weeks until the drs induced at 38 weeks. at 16 weeks the found that it was a subchorionic bleed. i now have a healthy 2 year old. i hope everything turns out okay for you